Specifications

Chapter 3 - Operation
42S315F 3-3
3.3 Subreflector Adjustment
The following procedure should be used in the event that the antenna
performance demonstrates that a subreflector adjustment is necessary. The
purpose of the physical measurements to various points on the antenna is to
minimize any tilt, or lateral displacement of the subreflector with respect to
the main reflector surface and also to position the subreflector to its optimum
optical location along the adjustment axis.
1. Ensure all antenna hardware including mount parts are installed and
tightened properly prior to making any subreflector adjustment.
2. To establish a reference, measure the distance from the feed window
to the subreflector apex as shown in Figure 3-1, distance A.
NOTE
Measurement does not include the tuning plate or spacer.
The feed window should be flat.
Figure 3-1. Feed, Reflector, and Subreflector Distances